/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
*/

/*
 * trimregion.c++
 *
 */

#include "glimports.h"
#include "myassert.h"
#include "mystdio.h"
#include "trimregion.h"
#include "backend.h"

TrimRegion::TrimRegion(void)
{
}

void TrimRegion::setDu(REAL du)
{
   oneOverDu=1.0f/du;
}

void TrimRegion::init(long npts, Arc_ptr extrema)
{
   left.init(npts, extrema, extrema->pwlArc->npts-1);
   left.getNextPt();

   right.init(npts, extrema, 0);
   right.getPrevPt();
}

void TrimRegion::getPts(Arc_ptr extrema)
{
   left.getNextPts(extrema);
   right.getPrevPts(extrema);
}

void TrimRegion::getPts(Backend& backend)
{
   left.getNextPts(bot.vval, backend);
   right.getPrevPts(bot.vval, backend);
}

void TrimRegion::getGridExtent(void)
{
   getGridExtent(left.last(), right.last());
}

void TrimRegion::getGridExtent(TrimVertex* l, TrimVertex* r)
{
   bot.ustart=(long)((l->param[0]-uarray.uarray[0])*oneOverDu);

   if (l->param[0]>=uarray.uarray[bot.ustart])
   {
      bot.ustart++;
   }
   assert(l->param[0]<=uarray.uarray[bot.ustart]);
   assert(l->param[0]>=uarray.uarray[bot.ustart-1]);

   bot.uend=(long)((r->param[0]-uarray.uarray[0])*oneOverDu);
   if (uarray.uarray[bot.uend]>=r->param[0])
   {
      bot.uend--;
   }
   assert(r->param[0]>=uarray.uarray[bot.uend]);
   assert(r->param[0]<=uarray.uarray[bot.uend+1]);
}

int TrimRegion::canTile(void)
{
   TrimVertex* lf=left.first();
   TrimVertex* ll=left.last();
   TrimVertex* l=(ll->param[0]>lf->param[0]) ? ll : lf; 

   TrimVertex* rf=right.first();
   TrimVertex* rl=right.last();
   TrimVertex* r=(rl->param[0]<rf->param[0]) ? rl : rf;

   return (l->param[0]<=r->param[0]) ? 1 : 0;
}
